... Abstract The causes of color changes of new complex drug “Pentacomponent pills from cold” were investigated. It was shown that ascorbic acid is responsible for color changes and this process is more intensive at presence of nitrogen-containing basic substances. ... Moscow University Chemistry Bulletin . 2007, Vol. ... 3, P. 178 . Copyright (C) Chemistry Dept., Moscow State University, 2002 . ... Copyright (C) Chemisty Department of Moscow State University . ...